期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 187, 期 1-3, 页码 355-361出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.01.032
关键词
Temperature phased anaerobic digestion; Waste activated sludge; Thermophilic temperature; pH; Retention time
资金
- Queensland State Government, Meat and Livestock Australia, and Environmental Biotechnology Cooperative Research Centre (EBCRC), Australia
Two-stage temperature phased anaerobic digestion (TPAD) is an increasingly popular method to improve stabilisation of sewage waste activated sludge, which normally has inherently poor and slow degradation. However, there has been limited systematic analysis of the impact of the initial thermophilic stage (temperature, pH and retention time) on performance in the main mesophilic stage. In this study, we demonstrate a novel two-stage batch test method for TPAD processes, and use it to optimize operating conditions of the thermophilic stage in terms of degradation extent and methane production. The method determines overall degradability and apparent hydrolysis coefficient in both stages. The overall process was more effective with short pre-treatment retention times (1-2 days) and neutral pH compared to longer retention time (4 days) and low pH (4-5). Degradabilities and apparent hydrolysis coefficients were 0.3-0.5 (fraction degradable) and 0.1-0.4 d(-1), respectively, with a margin of error in each measurement of approximately 20% relative (95% confidence). Pre-treatment temperature had a strong impact on the whole process, increasing overall degradability from 0.3 to 0.5 as temperature increased from 50 to 65 degrees C. with apparent hydrolysis coefficient increasing from 0.1 to 0.4 d(-1). (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据